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Re: Razor Blade and Glass

John Fitch wrote:

> I was unpleasantly surprised to read Gary Lange's comments on using a razor
> blade to remove algae from a glass tank:
> because I've been doing just that for some time with a razor blade mounted
> on the end of a dowel rod.  I will suspend that method until others confirm
> or reject Gary's dictum.

I've used razor blades in plastic holders to scrape algae off glass
tanks for a few decades.  I've never scratched the glass.

No matter what kind of scraper you use, don't get sand or gravel caught
between the blade and the glass.  Common minerals in sand and gravel
definitely will (if you press hard enough) scratch glass.

Roger Miller